A convenient method for the generation of O,S-acetal xanthates from aldehydes has been developed. The corresponding nucleophilic radicals undergo facile addition to unactivated olefins and the resulting adducts can be further elaborated to generate dienes and unsaturated δ-lactones.
                                    一种简便的方法已被开发用于从醛生成O,S-
缩醛黄原酸盐。相应的亲核自由基可轻松加成至非活化烯烃,且生成的加合物可进一步加工以产生二烯和具有不饱和δ-内酯结构的新化合物。